Quantum dot display device

Abstract

The application provides a quantum dot display device, comprising a light-emitting assembly and a display panel located on the light-emitting side of the light-emitting assembly, wherein the light-emitting assembly comprises a reflecting cavity, an excitation light source assembly and a plurality of pixel units; the reflecting cavity has an entrance; the reflecting cavity comprises a total reflection surface; the excitation light source assembly is used for emitting excitation light and making the excitation light enter the total reflection surface from the entrance for total reflection; each pixel unit comprises a plurality of sub-pixel filling cavities; the sub-pixel filling cavities are arranged in the reflecting cavity; the sub-pixel filling cavities are filled with quantum dots; and the quantum dots in different sub-pixel filling cavities in any pixel unit emit light of different colors after being excited by the excitation light. The application solves the problem of low color gamut caused by the limited light transmittance and brightness of the existing liquid crystal display.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a quantum dot display device. Background Technology

[0002] Currently, most LCD displays use white light-emitting elements as backlights. Different colored color resists are set in multiple sub-pixel areas of each pixel unit on the color filter substrate. For example, red, green, and blue color resists can be set separately. Through the filtering effect of the color resists, light of the corresponding color is emitted, and color display is achieved through light mixing. However, this method has limited luminous efficiency, and light transmittance and brightness are limited, resulting in a low color gamut. Summary of the Invention

[0003] This application provides a quantum dot display device. By setting sub-pixel filling cavities filled with quantum dots in the reflective cavity, and the quantum dots in different sub-pixel filling cavities emitting light of different colors after being excited by excitation light, the problem of low color gamut caused by the limited light transmittance and brightness of existing liquid crystal displays is solved.

[0004] This invention is implemented as follows: a quantum dot display device includes a light-emitting component and a display panel located on the light-emitting side of the light-emitting component. The light-emitting component includes a reflective cavity, an excitation light source component, and multiple pixel units. The reflective cavity has a light inlet and includes a total reflection surface. The excitation light source component is used to emit excitation light and direct it from the light inlet to the total reflection surface for total reflection. Each pixel unit includes multiple sub-pixel filling cavities, which are disposed within the reflective cavity. The sub-pixel filling cavities are filled with quantum dots, and the quantum dots in different sub-pixel filling cavities of any pixel unit emit light of different colors after being excited by the excitation light.

[0005] In one embodiment, the reflective cavity includes two first reflective walls disposed opposite to each other along the thickness direction of the display panel, the first reflective walls including the total reflective surface;

[0006] A plurality of baffles perpendicular to the first reflective walls are disposed between the two first reflective walls, and the baffles are configured to allow the excitation light to pass through while the propagation direction of the excitation light remains unchanged;

[0007] The plurality of the baffles are arranged intersectingly along the first direction and the second direction, and the baffles and the first reflective wall form the sub-pixel filling cavity, wherein the first direction, the second direction and the thickness direction of the display panel are perpendicular to each other.

[0008] In one embodiment, the barrier is made of a transparent polymer.

[0009] In one embodiment, the reflective cavity further includes a second reflective wall, which is disposed opposite to the light inlet along the first direction or the second direction, and the second reflective wall includes the total reflective surface.

[0010] In one embodiment, both the first reflective wall surface and the second reflective wall surface are total reflective surfaces.

[0011] In one embodiment, the reflective cavity is integrally formed.

[0012] In one embodiment, the excitation light source assembly includes an excitation light source and a controllable direction light guide plate disposed on the light-emitting side of the excitation light source;

[0013] The controllable direction light guide plate is used to control the excitation light emitted by the excitation light source to be directed from the light inlet to the total reflection surface of the first reflective wall.

[0014] In one embodiment, the excitation light source is an ultraviolet light strip or a short-wave blue light strip.

[0015] In one embodiment, each pixel unit includes a plurality of sub-pixel filling cavities, a red sub-pixel filling cavity, a green sub-pixel filling cavity, and a blue sub-pixel filling cavity;

[0016] The quantum dots filling the red sub-pixel cavity are red quantum dots, the quantum dots filling the green sub-pixel cavity are green quantum dots, and the quantum dots filling the blue sub-pixel cavity are blue quantum dots.

[0017] In one embodiment, the blue quantum dot is composed of a long-wavelength blue quantum dot conversion material, the red quantum dot is composed of a full-wavelength red quantum dot conversion material, and the green quantum dot is composed of a full-wavelength green quantum dot conversion material.

[0018] In one embodiment, the projected area of ​​the red sub-pixel filling cavity of each pixel unit on the first reflective wall is the same, the projected area of ​​the green sub-pixel filling cavity of each pixel unit on the first reflective wall is the same, and the projected area of ​​the blue sub-pixel filling cavity of each pixel unit on the first reflective wall is the same.

[0019] The projected area of ​​the blue sub-pixel filling cavity on the first reflective wall is greater than the projected area of ​​the red sub-pixel filling cavity on the first reflective wall and the projected area of ​​the green sub-pixel filling cavity on the first reflective wall.

[0020] The advantages of the quantum dot display device provided in this application are as follows: Compared with the prior art, this application sets multiple pixel units in the reflective cavity, and each pixel unit includes multiple sub-pixel filling cavities. Quantum dots are filled in the sub-pixel filling cavities. By using the excitation light emitted by the excitation light source component to achieve total internal reflection on the total internal reflection surface of the reflective cavity, different colors of light can be emitted by the quantum dots in different sub-pixel filling cavities of any pixel unit. In this way, color display can be achieved by mixing different colors of light. The sub-pixel filling cavities filled with quantum dots are equivalent to the color resist blocks in the color filter substrate. The emission of light by the quantum dots after excitation is equivalent to the color resist blocks filtering the light. This application sets the color resist layer in the existing color filter substrate in the reflective cavity, that is, it combines the color resist layer and white backlight in the prior art. This not only improves the light transmittance and brightness and expands the color gamut, but also saves the cost of manufacturing the color resist layer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the quantum dot display device provided in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the arrangement of sub-pixel filling cavities in the quantum dot display device provided in the embodiments of this application;

[0023] Figure 3 This is an optical path diagram of the excitation light emitted from the excitation light source of the quantum dot display device provided in this application embodiment within the reflective cavity;

[0024] Figure 4 This is a schematic diagram of the propagation of excitation light emitted from the excitation light source of the quantum dot display device provided in this application through a barrier wall;

[0025] Figure 5 This is a schematic diagram showing the installation position of the excitation light source assembly of the quantum dot display device provided in this application embodiment.

[0026] Reference numerals: 10, Light-emitting component; 20, Display panel;

[0027] 1. Reflecting cavity; 11. Light entrance port; 100. Total reflection surface; 12. First reflecting wall; 13. Second reflecting wall; 14. Semi-transparent and semi-reflective plate;

[0028] 2. Excitation light source assembly; 21. Excitation light source; 22. Controllable direction light guide plate;

[0029] 3. Pixel unit; 30. Subpixel filling cavity; 31. Red subpixel filling cavity; 32. Green subpixel filling cavity; 33. Blue subpixel filling cavity;

[0030] 4. Quantum dots; 5. Retaining walls. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0036] This application provides a quantum dot display device that solves the problem of limited light transmittance and brightness in existing liquid crystal displays, resulting in a low color gamut.

[0037] refer to Figure 1The quantum dot display device provided in this application includes a light-emitting component 10 and a display panel 20 located on the light-emitting side of the light-emitting component 10. The light-emitting component 10 is used to emit backlight so that the display panel 20 can achieve color display. The backlight emitted by the light-emitting component 10 can be white light or blue light. Taking white light as an example, the white backlight in existing quantum dot display devices usually uses ultraviolet light to excite red and green quantum dots to emit red and green light, which are then mixed with blue light to produce white light. On the color filter substrate side, the white light is converted into red, green and blue light by a color filter layer to meet different color requirements. In this way, the short-wavelength ultraviolet light and blue light will be emitted and directed towards the display panel 20. When the human eye looks at the display panel 20, it will be harmed to a certain extent, such as cataracts. Therefore, existing display devices will set a filter on the color filter substrate to absorb ultraviolet light and short-wavelength blue light. This will increase the manufacturing steps of the display device and also increase the manufacturing cost of the display device. Moreover, white light can only be converted into red, green and blue light after passing through the color filter layer, which reduces the light transmittance and brightness, resulting in a lower color gamut.

[0038] refer to Figure 1 and Figure 2 In this embodiment, the light-emitting component 10 includes a reflective cavity 1, an excitation light source component 2, and multiple pixel units 3. The reflective cavity 1 has a light inlet 11 and includes a total reflection surface 100. The excitation light source component 2 is used to emit excitation light and direct it from the light inlet 11 to the total reflection surface 100 for total reflection. Each pixel unit 3 includes multiple sub-pixel filling cavities 30. The sub-pixel filling cavities 30 are disposed in the reflective cavity 1 and are filled with quantum dots 4. The quantum dots 4 in different sub-pixel filling cavities 30 of any pixel unit 3 emit light of different colors after being excited by the excitation light.

[0039] Quantum dot 4 (QD4) is an important low-dimensional semiconductor material, with its dimensions in all three dimensions not exceeding twice the exciton Bohr radius of its corresponding semiconductor material. QD4 is generally spherical or near-spherical, with diameters typically between 2 and 20 nm. Common QD4 components are composed of IV, II-VI, IV-VI, or I II-V elements. Specific examples include silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, and indium arsenide quantum dots. When stimulated by light or electricity, QD4 emits colored light. The color of the light is determined by the constituent materials, size, and shape of the QD4. Therefore, by changing the morphology of QD4 (e.g., changing the particle size), high-peak pure-color light ranging from red to blue can be obtained.

[0040] In this embodiment, the excitation light emitted by the excitation light source component 2 is directed from the light inlet 11 of the reflective cavity 1 to the reflective cavity 1, thereby exciting the quantum dots 4 filled in the sub-pixel filling cavity 30 within the reflective cavity 1 to emit light. In this way, the sub-pixel filling cavity 30 filled with quantum dots 4 can be regarded as a sub-pixel. After the quantum dots 4 in different sub-pixel filling cavities 30 of any pixel unit 3 are excited by the excitation light, they emit light of different colors. This is equivalent to combining the color filter layer and the backlight. Instead of converting white light into red, green and blue light through the color filter layer, red, green and blue light are emitted directly. This increases the transmittance of different colors of light emitted by different pixels.

[0041] Furthermore, since the reflective cavity 1 has a total internal reflection surface 100, the excitation light undergoes total internal reflection within the reflective cavity 1. This means the excitation light forms a light-locked loop within the reflective cavity 1 and does not escape. This allows for the full excitation of the quantum dots 4 filling the sub-pixel filling cavity 30, improving the excitation efficiency and resulting in better pixel luminous intensity and effect. Moreover, since the excitation light only propagates within the reflective cavity 1 and does not escape, there is no risk of harm to the human eye. Therefore, there is no need for a filter to absorb the excitation light, simplifying the manufacturing process of the display device and reducing its cost.

[0042] In some embodiments, quantum dots 4 can be filled into the sub-pixel filling cavity 30 by deposition or sputtering. The quantum dots 4 filling each sub-pixel filling cavity 30 need to be distributed as uniformly as possible within the cavity to ensure uniform light emission and effective pixel opening. Furthermore, to achieve uniform distribution of quantum dots 4 within the sub-pixel filling cavity 30, a nanoporous framework can be provided within the cavity 30. This nanoporous framework is a small-pore porous silica framework with pores. The quantum dots 4 are filled into these pores, allowing for orderly adjustment and control of the arrangement and size of the quantum dots 4. This results in more uniform, stable, and ordered quantum dots 4, effectively controlling the uniformity of light emitted after excitation, leading to better light emission from different pixels and improved color display performance.

[0043] In some embodiments, each pixel unit 3 has multiple sub-pixel filling cavities 30, including a red sub-pixel filling cavity 31, a green sub-pixel filling cavity 32, and a blue sub-pixel filling cavity 33. The quantum dots 4 filled in the red sub-pixel filling cavity 31 are red quantum dots, the quantum dots 4 filled in the green sub-pixel filling cavity 32 are green quantum dots, and the quantum dots 4 filled in the blue sub-pixel filling cavity 33 are blue quantum dots. This allows for the formation of red, green, and blue sub-pixels, with each pixel unit 3 including red, green, and blue sub-pixels, thus enabling color display using multiple different colors of light.

[0044] It should be noted that the red subpixel filling cavity 31, green subpixel filling cavity 32 and blue subpixel filling cavity 33 of each pixel unit 3 are arranged in the same order, and multiple pixel units 3 are arranged in a matrix. This is equivalent to transferring the color filter layer from the color filter substrate to the reflective cavity 1. This not only allows the subpixels to emit light directly, improving light transmittance and color display effect, but also eliminates the step of setting the color filter layer on the color filter substrate, saving manufacturing costs.

[0045] Since the excitation light emitted by the excitation light source component 2 of this application only propagates within the reflection cavity 1, and the sub-pixel filling cavity 30 is entirely located within the reflection cavity 1, meaning that the quantum dots 4 are all located within the reflection cavity 1 and emit light after being excited by the excitation light, the display panel 20 of the quantum dot display device of this application can be a planar display panel 20 or a curved display panel 20. This application does not limit the specific implementation.

[0046] In some embodiments, reference Figure 1 The reflective cavity 1 includes two first reflective walls 12 disposed opposite to each other along the thickness direction Z of the display panel 20. Each first reflective wall 12 includes a total reflective surface 100. A plurality of baffles 5 perpendicular to the first reflective walls 12 are disposed between the two first reflective walls 12. The baffles 5 are configured to allow excitation light to pass through while the propagation direction of the excitation light remains unchanged. The plurality of baffles 5 are arranged intersectingly along the first direction X and the second direction Y, respectively. The baffles 5 and the first reflective walls 12 form a sub-pixel filling cavity 30, wherein the first direction X, the second direction Y and the thickness direction Z of the display panel 20 are perpendicular to each other.

[0047] By setting multiple baffles 5 perpendicular to the first reflective walls 12 between the two first reflective walls 12, and the multiple baffles 5 are arranged intersectingly along the first direction X and the second direction Y respectively, an array of sub-pixel filling cavities 30 can be formed in the reflective cavity 1. This allows the quantum dots 4 filled in the sub-pixel filling cavity 30 to be excited and emit light to form an array of sub-pixels, which is equivalent to a color filter layer, and can realize the color display of the display panel 20.

[0048] The first reflective wall 12 of this application includes a total reflection surface 100. Specifically, the reflective cavity 1 can be made of a light-transmitting material with a low refractive index. In this way, the reflective cavity 1 is filled with air. The refractive index of the excitation light in the reflective cavity 1 is greater than the refractive index of the excitation light on the first reflective wall 12. Therefore, the inner surface of the first reflective wall 12 is a total reflection surface 100. The excitation light is totally reflected on the inner surface of the first reflective wall 12, which is equivalent to the reflective cavity 1 creating a light lock for the excitation light. In this way, the excitation light will not escape from the reflective cavity 1. Since the excitation light used to excite the quantum dot 4 to emit light is generally short-wavelength blue light or ultraviolet light, the excitation light only exists in the reflective cavity 1, which can avoid causing damage to the human eye.

[0049] In some embodiments, the retaining wall 5 is made of a transparent polymer.

[0050] Among them, the transparent polymer can be a transparent plastic, such as polymethyl methacrylate (PMMA), polystyrene (PS), polycarbonate (PC), styrene-acrylonitrile (AS and SAN), and styrene-methyl methacrylate copolymer (MS).

[0051] refer to Figure 4 The barrier 5, made of transparent polymer, allows the excitation light to pass through without changing its propagation direction. This ensures that the excitation light is totally internally reflected within the reflective cavity 1 and does not escape from the cavity. This not only prevents the excitation light from escaping from the cavity and harming the human eye, but also allows the quantum dots 4 filled in the sub-pixel filling cavity 30 to be fully excited, thus improving the excitation efficiency.

[0052] It should be noted that the specific arrangement of the reflective cavity 1 and the baffle 5 can be as follows: first, the reflective cavity 1 is made, and then quantum dots 4 and baffle 5 are set in the reflective cavity 1 from the light inlet 11 in sequence; or, baffle 5 is set on one of the first reflective walls 12 of the reflective cavity 1, and then quantum dots 4 are filled in the rectangular grid formed by the intersection of the baffle 5, and finally the other first reflective wall 12 is set on the baffle 5.

[0053] In some embodiments, reference Figure 2 The reflective cavity 1 also includes a second reflective wall 13, which is disposed opposite to the light inlet 11 along a first direction X or a second direction Y. The second reflective wall 13 includes a total reflection surface 100. This allows the excitation light source assembly 2 and the reflective cavity 1 to be disposed on the same horizontal plane, without increasing the thickness of the quantum dot display device. Moreover, it allows the excitation light to propagate from the light inlet 11 of the reflective cavity 1 all the way to the second reflective wall 13, and then from the second reflective wall 13 back to the light inlet 11, improving the excitation efficiency of the excitation light and ensuring that the quantum dots 4 are fully excited, resulting in better sub-pixel light emission.

[0054] It should be noted that the reflective cavity 1 is cuboid in shape, and the height direction of the reflective cavity 1 is the thickness direction Z of the display panel 20. The first direction X and the second direction Y are the length direction and width direction of the reflective cavity 1, respectively. The reflective cavity 1 has only one opening, which is the light entrance 11. The two first reflective walls 12 are parallel to each other, and the second reflective wall 13 is perpendicular to the first reflective wall 12. The second reflective wall 13 and the light entrance 11 are arranged opposite to each other along the first direction X or the second direction Y. In this way, the excitation light entering the reflective cavity 1 from the light entrance 11 will propagate between the two first reflective walls 12, thereby exciting the quantum dots 4 in the sub-pixel filling cavity 30 to emit light.

[0055] Since the light inlet 11 is located on the side of the reflective cavity 1, the excitation light source assembly 2 will be located on the side of the reflective cavity 1. Compared with setting the light inlet 11 on the side of the reflective cavity 1 away from the display panel 20, this application can avoid increasing the thickness of the quantum dot display device, thereby increasing the size of the quantum dot display device.

[0056] In addition, refer to Figure 3 The second reflective wall 13 includes a total reflection surface 100, which means that the inner surface of the first reflective wall 12 is a total reflection surface 100. When the excitation light starts from the light inlet 11, passes through the total reflection surface 100 of the first reflective wall 12 for total reflection, and then propagates to the second reflective wall 13, the total reflection surface 100 of the second reflective wall 13 will reflect the excitation light back into the reflective cavity 1. The excitation light will then start from the second reflective wall 13, pass through the total reflection surface 100 of the first reflective wall 12 for total reflection, and then propagate to the light inlet 11. In this way, the quantum dot 4 will be excited twice, making the excitation of the quantum dot 4 more complete, thereby increasing the brightness of the light emitted by the quantum dot 4, and at the same time, the excitation light is fully utilized.

[0057] In some embodiments, the surfaces of the first reflective wall 12 and the second reflective wall 13 are both total reflective surfaces 100. In this way, total reflection can be achieved no matter where the excitation light hits the first reflective wall 12 and the second reflective wall 13, ensuring that the excitation light only propagates inside the reflective cavity 1 and does not escape from the reflective cavity 1.

[0058] Total internal reflection (TIR) ​​is an optical phenomenon. When light travels from a medium with a higher refractive index to a medium with a lower refractive index, if the angle of incidence is greater than a certain critical angle θc (when the light ray moves away from the normal), the refracted ray will disappear, and all incident rays will be reflected and will not enter the medium with the lower refractive index.

[0059] In some embodiments, the reflective cavity 1 is integrally formed. This allows the reflective cavity 1 to be manufactured in one piece, simplifying the manufacturing process of the reflective cavity 1.

[0060] It should be noted that the specific implementation of the integral molding of the reflective cavity 1 can be: the first reflective wall 12 and the second reflective wall 13 are made of the same material and the reflective cavity 1 is molded in one piece, so that the inner surface of the reflective cavity 1 formed in this way is the total reflective surface 100.

[0061] In some embodiments, optionally, the excitation light source assembly 2 includes an excitation light source 21 and a controllable direction light guide plate 22 disposed on the light-emitting side of the excitation light source 21; the controllable direction light guide plate 22 is used to control the excitation light emitted by the excitation light source 21 to be directed from the light inlet 11 to the total reflection surface 100 of the first reflective wall 12.

[0062] The direction of the excitation light emitted by the excitation light source 21 can be adjusted by the controllable direction light guide plate 22, so that the excitation light is directed from the light inlet 11 to the total reflection surface 100 on the first reflective wall 12, so that the total reflection is performed on the total reflection surface 100, ensuring that the excitation light will not be emitted outside the reflection cavity 1 and will not cause harm to the human eye.

[0063] It should be noted that when setting the excitation light source component 2, it is only necessary to ensure that the angle at which the excitation light is incident from the light inlet 11 into the reflection cavity 1 is such that the excitation light undergoes total internal reflection within the reflection cavity 1. The specific incident angle of the excitation light can be adjusted during actual setup, and this embodiment does not impose specific limitations.

[0064] In some embodiments, the excitation light source 21 can be an ultraviolet light strip or a short-wave blue light strip. The ultraviolet light strip or the short-wave blue light strip can be bonded together with the controllable direction light guide plate 22 to form a whole, so that the controllable direction light guide plate 22 can adjust and control the emission direction of ultraviolet light or short-wave blue light.

[0065] In some embodiments, reference Figure 1 The excitation light source assembly 2 and the reflecting cavity 1 are spaced apart. A semi-transparent semi-reflective plate 14 is provided at the light inlet 11. The semi-transparent semi-reflective plate 14 is configured to allow the excitation light emitted by the excitation light source 21 to pass through the semi-transparent semi-reflective plate 14 and be directed towards the total reflection surface 100 on the second reflecting wall 13, while blocking the excitation light reflected by the total reflection surface 100 from passing through the semi-transparent semi-reflective plate 14. In this way, the excitation light emitted by the excitation light source 21 can pass through the semi-transparent semi-reflective plate 14 and be directed from the light inlet 11 to the total reflection surface 100 on the first reflecting wall 12. After being totally reflected by the total reflection surface 100 on the second reflecting wall 13, the excitation light is again totally reflected by the total reflection surface 100 on the first reflecting wall 12. When it is reflected to the light inlet 11, the semi-transparent semi-reflective plate 14 ensures that the excitation light will not exit the reflecting cavity 1 from the light inlet 11 and will not damage the human eye.

[0066] It should be noted that the excitation light source assembly 2 and the reflective cavity 1 can be arranged side by side. The light emission direction of the excitation light source 21 is the same as the thickness direction Z of the display panel 20. The excitation light emission direction emitted by the excitation light source 21 can be adjusted by the controllable direction light guide plate 22 so that it is emitted from the light inlet 11 to the reflective cavity 1 and illuminates the total reflection surface 100 of the first reflective wall 12. In this way, the path of the excitation light in the reflective cavity 1 will be longer, so that the excitation light can more fully excite the quantum dots 4 filled in the reflective cavity 1. This is conducive to stronger brightness of the mixed light of red light emitted by red quantum dots, green light emitted by green quantum dots, and blue light emitted by blue quantum dots, thereby making the color light emission effect of the display panel 20 better.

[0067] In some embodiments, reference Figure 5 The excitation light source assembly 2 is positioned at the light inlet 11, and the controllable direction light guide plate 22 blocks the light inlet 11. Thus, the excitation light emitted by the excitation light source 21, after being directed by the controllable direction light guide plate 22, directly enters the total reflection surface 100 of the first reflective wall 12. Furthermore, after being reflected by the total reflection surface 100 of the second reflective wall 13, the excitation light propagates back towards the light inlet 11. Since the only opening of the reflective cavity 1 is blocked by the controllable direction light guide plate 22, the reflective cavity 1 is sealed, preventing the excitation light from escaping and thus avoiding damage to the human eye. The back-and-forth propagation of the excitation light between the light inlet 11 and the second reflective wall 13 not only fully excites the quantum dots 4, resulting in better pixel emission, but also effectively improves the utilization rate of the excitation light.

[0068] In some embodiments, the blue quantum dots are composed of long-wavelength blue quantum dot conversion materials, the red quantum dots are composed of full-wavelength red quantum dot conversion materials, and the green quantum dots are composed of full-wavelength green quantum dot conversion materials. In this way, the blue light emitted by the blue quantum dots is long-wavelength blue light, which avoids the harmful effects of short-wavelength blue light emanating from the reflecting cavity 1 on the human eye.

[0069] It should be noted that the red light emitted by the red quantum dots in the red sub-pixel filling cavity 31 after being excited, the green light emitted by the green quantum dots in the green sub-pixel filling cavity 32 after being excited, and the blue light emitted by the blue quantum dots in the blue sub-pixel filling cavity 33 after being excited serve as light-emitting pixels. Therefore, the reflective cavity 1 has the function of transmitting light, so the blue light emitted by the blue quantum dots after being excited will be emitted out of the reflective cavity 1. The short-wavelength band of blue light can be harmful to the human eye. Therefore, this application uses a long-wavelength blue quantum dot conversion material to form the blue quantum dots. In this way, the blue light generated after the blue quantum dots are excited is long-wavelength blue light. The long-wavelength blue light emitted out of the reflective cavity 1 will not harm the human eye and can play a certain role in protecting the human eye. At the same time, it will not affect the use of the blue light emitted by the blue quantum dots after being excited as a blue pixel.

[0070] It should be noted that the blue light emitted by the blue quantum dot after being excited is scattered in all directions, so the blue light will escape from the reflective cavity 1. However, the excitation light emitted by the excitation light source 21 (such as short-wavelength blue light) enters the reflective cavity 1 at a certain angle and is totally reflected on the total reflection surface 100 inside the reflective cavity 1, so the excitation light will not escape from the reflective cavity 1.

[0071] In some embodiments, reference Figure 2 The red sub-pixel filling cavity 31 of each pixel unit 3 has the same orthographic projection area on the first reflective wall 12, the green sub-pixel filling cavity 32 of each pixel unit 3 has the same orthographic projection area on the first reflective wall 12, and the blue sub-pixel filling cavity 33 of each pixel unit 3 has the same orthographic projection area on the first reflective wall 12. The orthographic projection area of ​​the blue sub-pixel filling cavity 33 on the first reflective wall 12 is greater than the orthographic projection area of ​​the red sub-pixel filling cavity 31 on the first reflective wall 12 and the orthographic projection area of ​​the green sub-pixel filling cavity 32 on the first reflective wall 12.

[0072] In this embodiment, when long-wavelength blue quantum dot conversion material is used to construct blue quantum dots, the blue light emitted after the blue quantum dots are excited is long-wavelength blue light, while the red quantum dots emitted after being excited emit full-wavelength red light, and the green quantum dots emitted after being excited emit full-wavelength green light. Since the chromaticity of long-wavelength blue light may be bluish-green, the white light formed after mixing red, green, and long-wavelength blue light will have a yellowish-green tint. Because there is a linear relationship between pixel aperture size and luminous intensity, that is, increasing the pixel aperture will increase the pixel luminous intensity, the aperture of the blue sub-pixel can be increased to improve the transmittance and intensity of blue light, thereby improving the problem of the yellowish-green tint of the white light formed after mixing red, green, and long-wavelength blue light.

[0073] It should be noted that the openings of the red sub-pixels, green sub-pixels, and blue sub-pixels in each pixel unit 3 are all equal. This ensures that the opening size of each pixel unit 3 is equal, which is beneficial for controlling the luminous intensity of different pixels to mix light and form different colors for color display. When the red, green, and blue sub-pixels all emit full-wavelength light, the mixed light from the red, green, and blue sub-pixels forms standard-color white light. However, the blue sub-pixels emit long-wavelength blue light, resulting in a weaker blue light intensity and a bluish-green hue. This application sets the opening size of the blue sub-pixels to be larger than that of the red and green sub-pixels. This increases the intensity of the long-wavelength blue light and effectively improves the problem of the white light formed by the mixing of red, green, and blue sub-pixels appearing yellowish-green.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A quantum dot display device, comprising a light-emitting component (10) and a display panel (20) located on the light-emitting side of the light-emitting component (10), characterized in that, The light-emitting component (10) includes: A reflecting cavity (1) having an entrance port (11) and including a total reflection surface (100); An excitation light source assembly (2) is used to emit excitation light and direct it from the light inlet (11) to the total reflection surface (100) for total reflection. Multiple pixel units (3), each pixel unit (3) includes multiple sub-pixel filling cavities (30), the sub-pixel filling cavities (30) are disposed in the reflection cavity (1), the sub-pixel filling cavities (30) are filled with quantum dots (4), and the quantum dots (4) in different sub-pixel filling cavities (30) in any pixel unit (3) emit light of different colors after being excited by the excitation light; The reflective cavity (1) includes two first reflective walls (12) arranged opposite to each other along the thickness direction (Z) of the display panel (20), and the first reflective wall (12) includes the total reflective surface (100); a plurality of baffles (5) perpendicular to the first reflective walls (12) are arranged between the two first reflective walls (12), and the baffles (5) are configured to allow the excitation light to pass through while the propagation direction of the excitation light remains unchanged; the plurality of baffles (5) are arranged intersectingly along the first direction (X) and the second direction (Y), and the baffles (5) and the first reflective walls (12) enclose the sub-pixel filling cavity (30), wherein the first direction (X), the second direction (Y) and the thickness direction (Z) of the display panel (20) are perpendicular to each other in pairs; The reflecting cavity (1) further includes a second reflecting wall (13), the second reflecting wall (13) and the light inlet (11) are arranged opposite to each other along the first direction (X) or the second direction (Y), and the second reflecting wall (13) includes the total reflection surface (100); The excitation light source assembly (2) includes an excitation light source (21) and a controllable direction light guide plate (22) disposed on the light-emitting side of the excitation light source (21); The controllable direction light guide plate (22) is used to control the excitation light emitted by the excitation light source (21) to be directed from the light inlet (11) to the total reflection surface (100) of the first reflective wall (12).

2. The quantum dot display device according to claim 1, characterized in that, The retaining wall (5) is made of a transparent polymer.

3. The quantum dot display device according to claim 1, characterized in that, The surfaces of the first reflective wall (12) and the second reflective wall (13) are both total reflective surfaces (100); And / or, the reflective cavity (1) is integrally formed.

4. The quantum dot display device according to any one of claims 1-3, characterized in that, The excitation light source (21) is an ultraviolet light strip or a short-wave blue light strip.

5. The quantum dot display device according to any one of claims 1-3, characterized in that, Each pixel unit (3) includes a plurality of sub-pixel filling cavities (30) comprising a red sub-pixel filling cavity (31), a green sub-pixel filling cavity (32), and a blue sub-pixel filling cavity (33); The quantum dots (4) filled in the red sub-pixel filling cavity (31) are red quantum dots, the quantum dots (4) filled in the green sub-pixel filling cavity (32) are green quantum dots, and the quantum dots (4) filled in the blue sub-pixel filling cavity (33) are blue quantum dots.

6. The quantum dot display device according to claim 5, characterized in that, The blue quantum dots are composed of long-wavelength blue quantum dot conversion materials, the red quantum dots are composed of full-wavelength red quantum dot conversion materials, and the green quantum dots are composed of full-wavelength green quantum dot conversion materials.

7. The quantum dot display device according to claim 6, characterized in that, The red sub-pixel filling cavity (31) of each pixel unit (3) has the same orthographic projection area on the first reflective wall (12), the green sub-pixel filling cavity (32) of each pixel unit (3) has the same orthographic projection area on the first reflective wall (12), and the blue sub-pixel filling cavity (33) of each pixel unit (3) has the same orthographic projection area on the first reflective wall (12). The orthographic projection area of ​​the blue sub-pixel filling cavity (33) on the first reflective wall (12) is greater than the orthographic projection area of ​​the red sub-pixel filling cavity (31) on the first reflective wall (12) and the orthographic projection area of ​​the green sub-pixel filling cavity (32) on the first reflective wall (12).

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